The front-runner in Mexico's presidential race stumbled in a high-profile way at a world-class book festival on Saturday, when, over several minutes, he appeared unable to correctly name a book that's influenced his life, besides the Bible.

And even then, Enrique Peña Nieto fumbled, not citing an "author" or a prophet whose biblical verse has particularly touched him. Instead, he merely made a vague reference to "some passages of it."

He also confused the names of two well-known Mexican authors, Enrique Krauze and Carlos Fuentes, in a four-minute episode that ended with the candidate red-faced, saying, "The truth is, when I read a book I often don't fully register the titles."

Adding to the embarrassment, Peña Nieto's teen daughter, Paulina, used a slur and a separate offensive term for poor people while defending her dad in two late-night tweets. Paulina's Twitter profile has since disappeared, and her father issued an apology Monday morning.

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